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The behaviour the OP describes only happens when auto drawing coordination is turned on. The "original" number assigned to the drawing label on creation (with auto drawing coordination ticked) seems to "stick", and renumbering your drawing labels (without creating duplicate drawing label numbers) doesn't seem to work IF you renumber the label to a number that was previously used by any of the other labels on the sheet (even they they have been renumbered).

Have I confused?

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I wasn't able to replicate the issue in 2011 or 2012 either actually, which leads me to believe I have the steps wrong. Here is a step by step I used in a new blank file to test this in Vectorworks 2011 SP5:

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This may not be the case for you, but I use a template where the drawing labels are in a "nonprint" class, which I change to "none" when the labels are needed. Sometimes if that class is turned off I forget the labels are there. Auto-numbering, however, does not forget they are there. Having said that, from the specifics provided it does seem like you are experiencing some kind of file corruption.

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Please do! The main problem is that often a Layer Import can get you away from document-specific issues, but Sheet Layer info doesn't get brought over when you perform an import, which is predominantly where drawing labels reside.

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No, my experience was not related to layer or sheet imports but resulted from changing the numbering as describe by Col37400 after adding in new viewports (as opposed to copying viewports on sheet layer)

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When I start a new project I tend to re-use a file from a previous one, deleting the project-specific info but retaining the basic layer/class set-up etc. It's a lazy alternative to setting up a fresh template file.

So this issue could be related to a problem in the drawing file that gets copied over each time. Thinking about it, the drawing file I'm currently using would have originated when I was using VW2008.

It's not really an option to rebuild the current file. But I suppose I should think about making a template from scratch for future projects.

Any suggestions about how to fix it in my current file would be welcome though.

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I think I might have worked out how to fix this, at least in some situations.

It seems that if you have several viewports on a sheet, even if some of them don't have a drawing number label, VW has assigned them a number anyway. So, say you have 6 viewports, and you have one labelled "1" but no labels attached to the others.

You are then trying to label one of the others "2" but VW is telling you that number's already in use.

I think this is because it thinks one of the un-labelled viewports is no. 2. It may also think that all the other viewports have a number as well.

So I think you can sort it out like this -

apply high-number labels to all those viewports...say, number them 10,11,12,13 and 14. Now they have a label sequence that doesn't cause VW conflicts, and the number 2,3,4,5 and 6 slots are free.

I *think* it generally then works to go back and re-number those viewports with the sequence you want.